The TH400 is an automatic shift, three-speed, longitudinally positioned transmission. It is well known, especially to commercial vehicle owners and drag racers to be a supremely durable and legendary performance upgradeable transmission. Rebuilt transmissions can be purchased in stock to racing applications.
The Turbo Hydramatic-400 is mildly rated to handle at least 450 ft. lbs. of input torque. Aftermarket building updates and extreme duty parts take it well past that figure.
Historically, the Turbo 400 was introduced in 1964 in Buick and Cadillac cars and in Chevrolet and Oldsmobile cars the following year. The short-lived innovation of the variable pitch (VP) stator was available in the 1965-1967 cars, which was way ahead of it’s time, to become a lock up torque converter in later years, although never offered in the T-400.
The T-400 made its way into heavier duty GM trucks in the 1970’s in 2wd and 4wd configurations. The 400 was not just a GM exclusive transmission. It is an immensely popular transmission, adapted in the automotive industry, using factory and aftermarket made engine to transmission adapters to be found in GM’s, Jeeps, Jaguars, Rolls-Royces, Ferraris and custom applications.
As with other GM transmissions, GM changed the naming system of the TH400 in 1987 and it was then referred to as the 3L80 (3-speeds, Longitudinally positioned, 8000 lbs. GVW). An overdrive version of it was introduced in 1991 as the T-4L80-E. This electronically controlled transmission remains in production and enjoys the same highly successful reputation as the T-400, and in widely use in heavy-duty GM and military applications.
The most common form of T-400 is a remanufactured transmission. Primarily because they have been out of production so long. For a list of transmissions and a quote call 866-320-1182 and talk to a specialist now. Enjoy more transmission articles on our GotTransmissions.com Blog..
